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Abstract

In the last year, JET tokamak performance has been progressively raised, culminating in operation at the full design level of 5 MA plasma current in a toroidal field at 3.4T. Plasma control has been improved with the plasma current, position, shape and line average electron density all now controlled by feedback systems. By glow discharge cleaning in hydrogen - methane mixtures, the interior of the vessel has been coated with carbon (carbonization). This reduces the fraction of power radiated to <or=50% at intermediate densities and raises the density limit for disruption by 10%. Operation over a wide range of parameters, including varying major and minor radii, has given data for more extensive scaling studies. With ohmic heating, the maximum global energy confinement time is 0.8 +- 0.1 s and the maximum central ion temperature about 3.0 keV. The highest (n tau-E T-i) product is reached with ohmic heating in a deuterium plasma and is about 6 x 10**19m**-3 keV+-20%.

Additional information

Authors: BICKERTON R J JET JOINT UNDERTAKING, ABINGDON (UK), JET JOINT UNDERTAKING, ABINGDON (UK)
Bibliographic Reference: WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK), MENTIONING REPORT JET-P(85)15, 1985
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